The actual title is "Starman El Libertario". The cover artist could be Agustín Gómez Díaz. He did most of covers of the series according to Modesto Vásquez, one of the creators with Rafael Navarro. The rest of the creative team was formed by Waldo Miró (scripting) and Arnulfo Mora (inside art).

Here's a cool Starman re-do on Deviantart. It says the comic is from the 70s/80s. It's weird how after doing some searches lots of people seem to know about the series but it's hard to find anything very specific.

I've taken the info from a book by Modesto Vázquez called "La Historiética". He was referring to the creative team responsible of the whole series so there is a good chance it was Agustín Gómez Díaz.I looked for the actual issue in my collection and found it! It was originally published by Editora Ra-Ca-Na in march 11th 1981, but that's the mexican edition. The one you feature here is from the South American edition printed in Colombia by Editora Cinco. I can't confirm that it was published on the same date but it was released shortly after that because they were very coordinated. There is no info about the cover artist on the actual comic-book.

Starman was published weekly, every Wednesday. It started in 1978 and lasted until the mid-eighties. It featured Starman, a hero powered by the sun. The bad guy was Moloch, an evil dictator that ruled Earth. The best thing about the comic was Starman's sidekick, Gatónico. It's a robot shaped like a sphere that resembles a cat. It makes no sense and it's great.